Gears of War never had the most complicated of plots (until the last chapter of the third game, at least). Instead, it was about the characters; the Gears of the COG army, dedicated to eliminating the Locust Horde one grub at a time.
But just because it doesn't have an incredibly in-depth story doesn't mean we don't have questions about it. On the contrary--because so much is left unexplained, there's plenty of stuff we've always wondered about the universe. With Gears of War: Judgment right around the corner, we thought it was a great time to get curious about the inner-working of the COG machine.